[v2,06/15] parport: Remove the now superfluous sentinel element from ctl_table array

Commit Message

Joel Granados via B4 Relay Oct. 2, 2023, 8:55 a.m. UTC

From: Joel Granados <[e-mail]>

This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/[e-mail]/)

Remove the unneeded ctl_tables that were used to register intermediate
parport directories; only the path is needed at this point. From
parport_device_sysctl_table we removed: devices_root_dir, port_dir,
parport_dir and dev_dir. From parport_default_sysctl_table we removed:
default_dir, parport_dir and dev_dir. Reduce the size by one of the
ctl_table arrays that were not removed

Assign different sizes to the vars array in parport_sysctl_table
depending on CONFIG_PARPORT_1284; this is necessary now that the sysctl
register function uses ARRAY_SIZE to calculate the elements within.
Remove the sentinel element from parport_sysctl_template,
parport_device_sysctl_table and parport_default_sysctl_table.

Signed-off-by: Joel Granados <[e-mail]>
---
 drivers/parport/procfs.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

Patch

diff --git a/drivers/parport/procfs.c b/drivers/parport/procfs.c
index 4e5b972c3e26..532d5cbbd344 100644
--- a/drivers/parport/procfs.c
+++ b/drivers/parport/procfs.c
@@ -259,8 +259,12 @@  PARPORT_MAX_SPINTIME_VALUE;
 struct parport_sysctl_table {
 	struct ctl_table_header *port_header;
 	struct ctl_table_header *devices_header;
-	struct ctl_table vars[12];
-	struct ctl_table device_dir[2];
+#ifdef CONFIG_PARPORT_1284
+	struct ctl_table vars[10];
+#else
+	struct ctl_table vars[5];
+#endif /* IEEE 1284 support */
+	struct ctl_table device_dir[1];
 };
 
 static const struct parport_sysctl_table parport_sysctl_template = {
@@ -341,7 +345,6 @@  static const struct parport_sysctl_table parport_sysctl_template = {
 			.proc_handler	= do_autoprobe
 		},
 #endif /* IEEE 1284 support */
-		{}
 	},
 	{
 		{
@@ -351,19 +354,14 @@  static const struct parport_sysctl_table parport_sysctl_template = {
 			.mode		= 0444,
 			.proc_handler	= do_active_device
 		},
-		{}
 	},
 };
 
 struct parport_device_sysctl_table
 {
 	struct ctl_table_header *sysctl_header;
-	struct ctl_table vars[2];
-	struct ctl_table device_dir[2];
-	struct ctl_table devices_root_dir[2];
-	struct ctl_table port_dir[2];
-	struct ctl_table parport_dir[2];
-	struct ctl_table dev_dir[2];
+	struct ctl_table vars[1];
+	struct ctl_table device_dir[1];
 };
 
 static const struct parport_device_sysctl_table
@@ -379,7 +377,6 @@  parport_device_sysctl_template = {
 			.extra1		= (void*) &parport_min_timeslice_value,
 			.extra2		= (void*) &parport_max_timeslice_value
 		},
-		{}
 	},
 	{
 		{
@@ -388,17 +385,13 @@  parport_device_sysctl_template = {
 			.maxlen		= 0,
 			.mode		= 0555,
 		},
-		{}
 	}
 };
 
 struct parport_default_sysctl_table
 {
 	struct ctl_table_header *sysctl_header;
-	struct ctl_table vars[3];
-	struct ctl_table default_dir[2];
-	struct ctl_table parport_dir[2];
-	struct ctl_table dev_dir[2];
+	struct ctl_table vars[2];
 };
 
 static struct parport_default_sysctl_table
@@ -423,7 +416,6 @@  parport_default_sysctl_table = {
 			.extra1		= (void*) &parport_min_spintime_value,
 			.extra2		= (void*) &parport_max_spintime_value
 		},
-		{}
 	}
 };
 
@@ -443,7 +435,9 @@  int parport_proc_register(struct parport *port)
 	t->vars[0].data = &port->spintime;
 	for (i = 0; i < 5; i++) {
 		t->vars[i].extra1 = port;
+#ifdef CONFIG_PARPORT_1284
 		t->vars[5 + i].extra2 = &port->probe_info[i];
+#endif /* IEEE 1284 support */
 	}
 
 	port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);